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Block-Coupled Solution Algorithms for 2-equation Turbulence Models (CROSBI ID 405514)

Ocjenski rad | diplomski rad

Keser, Robert Block-Coupled Solution Algorithms for 2-equation Turbulence Models / Jasak, Hrvoje (mentor); Zagreb, Fakultet strojarstva i brodogradnje, . 2016

Podaci o odgovornosti

Keser, Robert

Jasak, Hrvoje

engleski

Block-Coupled Solution Algorithms for 2-equation Turbulence Models

Modern implicitly coupled pressure–velocity algorithms introduced a considerable increase in the convergence rates when compared with segregated algorithms. Although, segregated treatment of turbulence model equations often limits such algorithms from reaching their full potential. Hence, implicit coupling of two- equation turbulence models is investigated. In order to implement the implicitly coupled turbulence models in the block-matrix framework, it is necessary to linearise the non-linear source and sink terms. The linearised sources and sinks also need to undergo the stability and boundedness analysis. Linearisation and implementation of two-equation turbulence models, k-epsilon and k-omega SST, in foam- extend (the community-driven fork f the OpenFOAM) software is presented. Validation of implemented turbulence models is performed. The two validation cases are: a separated flow past a NACA 4412 airfoil at maximum lift and an incompressible turbulent flow over a backward facing step. Validation of the implicitly coupled k-omega SST model is performed for both cases, whereas validation of the implicitly coupled k-epsilon model is performed only for the backward facing step case. Finally, performance of implemented turbulence models is compared with existing segregated models. Benchmarking is performed on the two validation cases. Similarly as for the validation, both implemented turbulence models are benchmarked on the backward facing step case and only the k- omega SST is benchmarked on the NACA 4412 case.

CFD ; OpenFOAM ; foam-extend ; turbulence modelling ; k-e k-omega SST ; block-matrix ; implicit coupling ; lineartisation ; validation ; benchmarking

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Podaci o izdanju

110

25.03.2016.

obranjeno

Podaci o ustanovi koja je dodijelila akademski stupanj

Fakultet strojarstva i brodogradnje

Zagreb

Povezanost rada

Strojarstvo